Materials Literature
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Mesoporous carbon spheres (MCS) have been fabricated from structured mesoporous silica sphere using chemical vapor deposition (CVD) with ethylene as a carbon feedstock. The mesoporous carbon spheres have a high specific surface area of 666.8 m2/g and good electrochemical properties. The mechanism of formation mesoporo…
Ferroelectric transition of Sr 5 SmTi 3 Nb 7 O 30 tetragonal tungsten bronze ceramics was investigated using dielectric characterization, differential scanning calorimetry ( DSC ), and the in situ Raman scattering. The first‐order ferroelectric transition was indicated around 200°C by the dielectric peak and the endot…
Conductance bistability in Pt/Si–vinylidene fluoride (VDF) oligomer–Au ferroelectric tunnel junction devices is demonstrated. I–V and C–V measurements reveal bistable conductance switching within biasing voltage of ±0.5V with stable memory retention up to 1 × 104 cycles. The memory element exhibits a low switching vol…
The encapsulation of magnetic transition-metal (TM) clusters inside carbon cages (fullerenes, nanotubes) has been of great interest due to the wide range of applications, which spread from medical sensors in magnetic resonance imaging to photonic crystals. Several theoretical studies have been reported; however, our a…
Cellulose nanofibril/phenol formaldehyde (CNF/PF) composite films with high work of fracture were prepared by filtering a mixture of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) oxidized wood nanofibers and water-soluble phenol formaldehyde with resin contents ranging from 5 to 20 wt%, followed by hot pressing. The co…
We tested the hypothesis whether chemically induced motility patterns of bacteria may affect their transport in porous media. Naphthalene-degrading Pseudomonas putida G7 cells were exposed to glucose, salicylate, and silver nanoparticles (AgNPs) and their motility was assessed by computer-assisted, quantitative swimmi…
Es geht in beide Richtungen: Ein Thiol-reaktiver Netzbildner, der auf einem verbrückten Azobenzolderivat basiert, ermöglicht die photoreversible Steuerung der Peptidkonformation durch Bestrahlung mit violettem (407 nm) und grünem Licht (500–550 nm; siehe Bild). Der große Abstand der Absorptionsbanden der cis- (gelb) u…
Abstract The increased demand for high‐quality multifunctional materials in the aeronautic industry requires the formulation and preparation of advanced nanostructured composites with superior characteristics. In particular, epoxy‐based polymers, exhibiting excellent mechanical properties for structural stability, fil…
In theoretical studies of thin film and nanostructured semiconductors, pseudohydrogen (PH) is widely used to passivate the surface dangling bonds. Based on these calculations, it is often believed that nanostructured semiconductors, due to quantum confinement, have a larger band gap than their bulk counterparts. Using…
Thin UV-blocking films of poly(methyl methacrylate) (PMMA) and ZnO quantum dots (QDs) were built-up by spin-coating. Ellipsometry reveals average thicknesses of 9.5 and 8.6 nm per bilayer before and after heating at 100 °C for one hour, respectively. The surface roughness measured by Atomic force microscopy (AFM) was…
Abstract Molecular dynamics is employed to study the mechanical behavior of graphene nanoribbons with clamped edges under in‐plane strain. Buckling of nanoribbons results in the appearance of periodic ripples whose orientation, wavelength, and amplitude can be controlled by varying strain components and nanoribbon wid…
Successive reorientations of the Jahn–Teller axes associated with the CuII ions accompany a series of pronounced structural transitions in the title compound, as is shown by X-ray crystallography and high-frequency EPR measurements. The second transition forces a dimerization involving two thirds of the CuII sites due…
Using both computational and experimental analysis, we demonstrate a rich point-defect phase diagram in doped strontium titanate as a function of thermodynamic variables such as oxygen partial pressure and electronic chemical potential. Computational modeling of point-defect energetics demonstrates that a complex inte…
Protein phosphorylation is known to occur in Archaea. However, knowledge of phosphorylation in the third domain of life is rather scarce. Homology-based searches of archaeal genome sequences reveals the absence of two-component systems in crenarchaeal genomes but the presence of eukaryotic-like protein kinases and pro…
: Single graphene sheets, a few graphene layers, and bulk graphite, obtained via both micromechanical cleavage of highly oriented pyrolytic graphite and carbon vapor deposition methods, were deposited on a thin glass substrate without the use of any chemical treatment. Micro-Raman spectroscopy, tip-enhanced Raman spec…
A circular polarizer, which is composed of periodic and two-dimensional dielectric high-contrast gratings, is designed theoretically such that a unity conversion efficiency is achieved at λ(0)=1.55 μm. The operation is obtained by the achievement of the simultaneous unity transmission of transverse magnetic and transv…
This work presents a detailed analysis of the physical origin of the zero-field splittings (ZFSs) in a series of high-spin (S = 1) nickel(II) scorpionate complexes Tp*NiX (Tp* = hydrotris(3,5-dimethylpyrazole)borate, X = Cl, Br, I) using quantum chemical approaches. High-frequency and -field electron paramagnetic reso…
Complex coacervation driven by associative electrostatic interactions was studied in mixtures of exfoliated sodium-montmorillonite (Na(+)-MMT) nanoplatelets and fish gelatin, at a specific mixing ratio and room temperature. Structural and viscoelastic properties of the coacervate phase were investigated as a function…
Down to the wire: Pentacene exhibits crystal-plane-dependent photoluminescence (PL) activity, as demonstrated in highly crystalline 1D wires and 2D disks, which were selectively synthesized using the vaporization-condensation-recrystallization (VCR) process. Although pentacene 1D wires and 2D disks have identical tric…
Heart wall myofibers wind as helices around the ventricles, strengthening them in a manner analogous to the reinforcement of concrete cylindrical columns by spiral steel cables [Richart FE, et al. (1929) Univ of Illinois, Eng Exp Stn Bull 190]. A multitude of such fibers, arranged smoothly and regularly, contract and…